Perhaps you should try some spelling variations:
tdanh trung » thanh trung, thanh tung, dang trung
danh trung » dang trung, dinh trung, manh trung
hieu tinh » chieu tinh, lieu tinh, kieu tinh
cua nhung » va nhung
doc hieu » toc thieu, hoc thieu, hoc hien
cong dan » cong san, huong dan, cong dong
cong tan » cong tac, cong san, cong thanh
toan cau » toan cao, toan ban, toan tap

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: doc hieu tinh - ((danh trung) or (tdanh trung)) cua nhung ((cong dan) OR (cong tan)) toan cau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: doc hieu tinh - ((danh trung) OR (tdanh trung)) cua nhung ((cong dan) OR (cong tan)) toan cau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "doc hieu tinh - ((danh trung) or (tdanh trung)) cua nhung ((cong dan) OR (cong tan)) toan cau".
• Adding a wildcard symbol may retrieve word variants: doc hieu tinh - ((danh trung) or (tdanh trung)) cua nhung ((cong dan) OR (cong tan)) toan cau*.